Diaphragm shaft seal



? P. EN'DEBAK f July 8, 1947. I PIAIHRAGI SHAFT ssn.

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llrronwev Patented July 8, 1947 2,423,642 I DIAPHRAGM snar'r SEAL I Petcr Endebak, Chicago, n1, assignor to 'rutmu Pump Compa'ny, Chicago, 111., a corporation of Illinois Application August 31, 1944, Serial nmssaiza 3 Claims. ass-11 This invention relates to improvements in seals for rotating shafts or the like, and more particularly to seals of the flexible diaphragm type, and

heater its principal object to provide a simple and efllcient structure ofthe character described.

The invention may best be understood by reference to the accompanying drawing, in which: Figure 1'is a transverse section of a seal structure constructed in accordance with my invention, with certain parts shown infull.

Figure 2 is a detail section taken on of Figure 1.

Referring to the details of the embodiment of myinvention shown in the drawing, It indicates a shaft, and N indicates a pump or similar casline 2 having athreaded bore 36 'at'its innerend, and a tapered aperture 31 at its outer end for 'engaging the tapered portion, 34 of the bearing" collar 30. The arrangement is. such that by" ment against the thrust collar 11 under the yield ing having a journal bearing l2 and extended seal housing |3. Intermediate the ends of the housing I3 is an outwardly facingannular shoulder ll-forming a seat for a diaphragm l5. The-housing i adapted to be enclosed at its outer end by a detachable end cap it, which has a telescoping inner end portion 23 for securing the periphery of the diaphragm I! in fluid-tight seated relation against the shoulder H. The cap I8 may be secured to the housing l3 by cap screws 24.

A thrust collar I1 is loosely mounted on the shaft, and includes a cylindrical inner end DDr tion l3 and a flanged central outer portion |9.

; The ihner portion I3 fits in an aperture in the diaphragm and is provided with a plurality of longitudinal slots 2|, 2|, herein two in number,

extending from the inner end thereof, and in which tongues 22, 22 formed integrally with the diaphragm extend to restrain rotation of the thrust collar, but permit limited movement of the latter along the shaft.

An annular sealing ring 25', of suitable material and preferably of synthetic rubber such as Neoprene, is mounted on the cylindrical portion l8 of the thrust collar, in endwise abutting relation between the flanged portion l9 and the diaphragm l5. A coil spring26 surrounds the shaft and the inner end of the cylindrical portion l8 tightening the locking nut 35 on the bearing collar' 30, the tapered endoi'the latter will be clamped on the shaft at any adjusted position therealong,

with the bearing collar held in rotatable engageingcompression of spring 26.

Since the thrust collar I1 is restrained from rotation by-the tongues 22, 22 of the diaphragm IS, the sealing ring 25 is also restrained from rotation and forms a fluid-tight. joint between said diaphragm and the flanged portion IQ of said thrust collar.

Although I have shown and described certain embodiments of my invention, it will be understood that I do not wish to be limited to the exact construction shown and described, but that various changes and modifications may be made without departing from the spirit and scope of the invention as deflned'in the appended claims.

I claim:

1, In a seal for a rotatable member, a housing member, a flexible diaphragm having its periphery fixed with respect to said housing member and surrounding said rotatable member, a thrust collar loosely mounted on said rotatable member in slidable but non-rotative engagement with said diaphragm, said thrust collar having a radially extending shoulder in spaced relation to said diaphragm, an annular sealing member detachably surrounding a cylindrical portion of said with its inner end seated on the pump casing II and its outer end on the diaphragm i5 so as to urge the latter yieldingly toward the right, as seen in Figure 1.-

A bearing collar 30 is suitably fixed on the shaft in endwise abutting relation with the thrust 'phragm,

thrust collar and interposed between said diaphragm and the shoulder on said thrust collar, and an] annular bearing. collar detachably mounted on said rotatable member in rotatable engagement with the outer face of said thrust collar and maintaining said annular sealing member under yielding compression between said diaphragm and the shoulder on said thrust collar.

2, In a seal for a. rotatable member, a housing member, a flexible diaphragm having its periphery fixed with respect to said housing member and surrounding said rotatable member, a thrust collar loosely mounted on said rotatable member and having atongue and groove connection with said diaphragm affording axially slidable but non-ro tative engagement with said diaphragm, said thrust collar having a, radially extending shoul--" der normally in spaced relation from said diaan annular sealing member detachably surrounding a cylindrical portion of said thrust collar and interposed between said diaphragm n 3 and the shoulder on said thrust collar, and an annular bearing collar detachably mounted on said rotatablev member in rotatable engagement. with the, outer face of said thrust collar and maintaining said annular sealing member under yielding compression between said diaphragm and the shoulder on saidthrust collar. n

3. In a seal for arotatable member,'a housing member, a flexible diaphragm having its periphery fixed with respect to said housing member and surrounding sai'drotatable member, a thrust collar, loosely mounted on said rotatable member in slidable but non-rotative engagement with said diaphragm, said thrust collar having a radially extending, shoulder in spaced relation from said diaphragm, an annular sealing member detachably surrounding a cylindrical portion of said thrust collar and interposed between said diaphragm and the shoulder on said thrust collar,

an annular bearing collandetachably mounted on. said rotatable member in rotatable engagementwith the'outer face of saidthrust collar and maintaining, said annular: sealing member under the latter.

yielding compression between saiddiaphragm and the shoulder on said thrust collar, and a coil spring interposed between said housing member and said diaphragm on the side opposite said sealing member, and in substantial registry with I V v PETER j REFERENCES Crrmr The following references are of record in the file of: this patent;

UNITED T T S PATENTS Number Name I Date 2,051,301, Kleckner et al. Aug. 18, 1936 2,163,127 Limpert June 20, 1939 7 1,598,564 Earnshaw A118. 31,1926 2,216,218 wahlmark" Oct. 1, 1940 2,249,930 Bailey et a1 July 2-2, 1941 FOREIGN PATENTS" Number Country 7 'Date" 5 1 

